Current acquisition device, battery management system and battery

Abstract

The utility model is suitable for the technical field of electronics, and provides a current acquisition device, a battery management system and a battery, the current acquisition device comprises a signal recovery circuit and a communication module, the current acquisition device is provided with the signal recovery circuit used for acquiring an internal power supply voltage and an internal output voltage; a communication module which is in communication connection with external equipment is used for sending a signal to the external equipment to back the sampling power supply voltage and the sampling output voltage which are acquired by the circuit, so that a comparison result of the sampling voltage and the sampling output voltage can be output according to a comparison result of the actually provided power supply voltage and the sampling power supply voltage; according to the method, the abnormal condition of impedance change of the connector is determined, so that the abnormal condition of the impedance of the connector can be accurately positioned under a lossless condition, and the reliability of the current acquisition device is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronics, and particularly relates to a current collection device, a battery management system and a battery. BACKGROUND

[0002] The current collection device is a device for converting a measured current into a measurable electrical signal (such as a voltage signal or a small current signal). The small open-loop current sensor is a miniaturized current collection device based on the Hall effect principle and designed with an open-loop structure, and is widely used in battery management systems (BMS), motor control, new energy vehicles and other scenarios.

[0003] However, the current collection device may not accurately sample the current due to a fault of the internal Hall element or due to a change in the impedance of the connector. Since the connector and the housing of the current collection device are usually integrated, it is not possible to locate the fault position of the current collection device under non-destructive conditions, that is, it is not possible to determine whether the inaccuracy of the current sampling result is caused by a fault of the internal Hall element or by a change in the impedance of the connector, which affects the reliability of the current collection device. UTILITY MODEL CONTENT

[0004] Therefore, the embodiments of the application provide a current collection device, a battery management system and a battery. The abnormality of the impedance of the connector can be located under non-destructive conditions, thereby improving the reliability of the current collection device.

[0005] In a first aspect, the embodiments of the application provide a current collection device, comprising:

[0006] a Hall element configured to output a sampling output voltage corresponding to a sampling current;

[0007] a connector configured to connect an external device to feed back the sampling output voltage to the external device and to transmit an external power supply voltage to the current collection device;

[0008] a signal back collection circuit connected to an internal power supply circuit of the current collection device and an output end of the Hall element, and configured to collect an internal power supply voltage and output a back collection power supply voltage, and to collect an internal output voltage and output a back collection output voltage;

[0009] a communication module connected to the signal back collection circuit and in communication connection with the external device, and configured to send the back collection power supply voltage and the back collection output voltage to the external device.

[0010] In the embodiment of the present application, the signal back collection circuit for collecting the internal power supply voltage and the internal output voltage is arranged in the current collection device, and the communication module in communication connection with the external device sends the back collection power supply voltage and the back collection output voltage collected by the signal back collection circuit to the external device. In this way, the comparison result of the actual provided power supply voltage and the back collection power supply voltage, and the comparison result of the sampling voltage and the back collection output voltage can be output to determine the abnormal condition of the impedance change of the connector, and the current sampling inaccuracy of the current collection device caused by the impedance abnormality of the connector can be accurately located in the non-destructive condition, and the reliability of the current collection device is improved.

[0011] In an optional implementation of the first aspect, the signal back collection circuit comprises:

[0012] The first sampling unit is connected with the signal output end of the Hall element, and the signal output end of the first sampling unit is connected with the first signal input end of the communication module, and is configured to collect the internal output voltage of the current collection device.

[0013] The second sampling unit is connected with the signal output end of the Hall element, and the signal output end of the second sampling unit is connected with the second signal input end of the communication module, and is configured to collect the internal output voltage of the current collection device.

[0014] In the embodiment of the present application, the first sampling unit and the second sampling unit can respectively sample the internal power supply voltage and the internal output voltage of the current collection device, and the interference between the two collection signals can be reduced.

[0015] In an implementation of the first aspect, the first sampling unit comprises a first voltage dividing resistor, a second voltage dividing resistor and a first current limiting resistor.

[0016] The first end of the first voltage dividing resistor is the signal collection end of the first sampling unit, the second end of the first voltage dividing resistor is connected with the first end of the second voltage dividing resistor and the first end of the first current limiting resistor respectively, the second end of the second voltage dividing resistor is grounded, and the second end of the first current limiting resistor is the signal output end of the first sampling unit.

[0017] In the embodiment of the present application, the simple resistor element can be used to collect the internal power supply voltage, and the implementation is simple and the implementation cost is low.

[0018] In an implementation of the first aspect, the second sampling unit comprises a third voltage dividing resistor, a fourth voltage dividing resistor and a second current limiting resistor.

[0019] The first end of the third voltage dividing resistor is a signal collection end of the second sampling unit, the second end of the third voltage dividing resistor is connected with the first end of the fourth voltage dividing resistor and the first end of the second current limiting resistor respectively, the second end of the fourth voltage dividing resistor is grounded, and the second end of the second current limiting resistor is a signal output end of the second sampling unit.

[0020] In the embodiment of the application, the simple resistance element can be used to realize the collection of the internal output voltage, and the realization is simple and the cost is low.

[0021] In an implementation form of the first aspect, the communication module is a wired communication module.

[0022] In an implementation form of the first aspect, the communication module is connected with the external device through a controller area network bus.

[0023] Alternatively, the communication module is connected with the external device through an industrial serial bus.

[0024] Alternatively, the communication module is connected with the external device through an integrated circuit bus.

[0025] In an implementation form of the first aspect, the communication module is a wireless communication module.

[0026] In an implementation form of the first aspect, the current collection device comprises a printed circuit board assembly.

[0027] The signal collection circuit and the communication module are integrated in the printed circuit board assembly.

[0028] In this way, the integration of the current collection device can be realized, the volume can be reduced, and the implementation cost can be reduced.

[0029] In a second aspect, an embodiment of the application provides a battery management system, which comprises the current collection device mentioned in the first aspect and various implementation forms thereof.

[0030] In a third aspect, an embodiment of the application provides a battery, which comprises a box body.

[0031] A battery module accommodated in the box body and the battery management system according to the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 A working principle schematic diagram of a current collection device provided by an embodiment of the application is shown in FIG. 1.

[0034] Figure 2 An application schematic diagram of a current collection device provided by an embodiment of the application is shown in FIG. 2.

[0035] Figure 3 An architecture schematic diagram of a current collection device provided by an embodiment of the application is shown in FIG. 3.

[0036] Figure 4 An architecture schematic diagram of a current collection device provided by another embodiment of the application is shown in FIG. 4.

[0037] Figure 5 A circuit implementation schematic diagram of a current collection device provided by an embodiment of the application is shown in FIG. 5.

[0038] Figure 6 Another circuit implementation schematic diagram of a current collection device provided by an embodiment of the application is shown in FIG. 6.

[0039] Figure 7 Still another circuit implementation schematic diagram of a current collection device provided by an embodiment of the application is shown in FIG. 7.

[0040] Figure 8 Still another circuit implementation schematic diagram of a current collection device provided by an embodiment of the application is shown in FIG. 8.

[0041] Figure 9 Still another circuit implementation schematic diagram of a current collection device provided by an embodiment of the application is shown in FIG. 9.

[0042] Figure 10 A connector double-line parallel connection schematic diagram of a current collection device provided by an embodiment of the application is shown in FIG. 10. DETAILED DESCRIPTION

[0043] The embodiments of the technical solutions of the application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the application, and therefore only serve as examples, and cannot be used to limit the protection scope of the application.

[0044] It should be noted that, unless otherwise specified, all technical terms used in the embodiments of the application have the same meanings as those commonly understood by the person skilled in the art to which the application belongs. The technical terms used in the embodiments of the application are only used to explain the specific embodiments of the application, and are not intended to limit the application.

[0045] In the description of the embodiments of the application, the technical terms “include”, “contain”, “have” and any variants thereof all mean “include but are not limited to”, unless otherwise specified.

[0046] In the description of the embodiments of the present application, unless otherwise specified, the technical term "a plurality of" refers to two or more than two, and the technical terms "at least one" and "one or more" refer to one, two or more than two.

[0047] The technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0048] The technical term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects have an "or" relationship.

[0049] The "embodiments" mentioned in the description of the embodiments of the present application mean that the specific features, structures or characteristics described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0050] The current acquisition device is a device that converts the measured current into a measurable electrical signal, such as a voltage signal or a small current signal. The small open-loop current acquisition device is a miniaturized current acquisition device based on the Hall effect principle and designed with an open-loop structure, which is widely used in battery management systems (BMS), motor control, new energy vehicles and other scenarios.

[0051] The small open-loop current sensor generally includes a primary conductor, a magnetic core, a Hall element, a printed circuit board assembly (PCBA) component, a housing, and a connector.

[0052] The primary conductor is a conductor through which the measured current flows, used to focus the magnetic field and improve detection accuracy. The magnetic core is usually a magnetic core made of soft magnetic material with high magnetic permeability, which functions to concentrate the magnetic field generated by the primary current and enhance the detection sensitivity of the Hall element. The Hall element is the core detection element, mainly used to convert the magnetic field signal into an electrical signal. The PCBA component usually integrates operational amplifier circuits, filter circuits, power supply circuits, etc. The housing serves the purpose of protection and fixation, and the connector can be used to connect with external devices, such as battery management systems, to transmit output signals (i.e. output voltage) and receive power supply.

[0053] Please refer to Figure 1 , Figure 1 A working principle schematic diagram of a current acquisition device is shown. Figure 1 The current acquisition device in the example shown can be a small open loop current acquisition device. As Figure 1 shown, the cylindrical conductor represents the primary conductor, and when the measured current (primary current) I p passes through the primary conductor of the small open loop current acquisition device, according to Ampere's law, a magnetic field proportional to the current size will be generated around the conductor; the Hall element is placed in the air gap of the magnetic core, and when the magnetic field passes through the Hall element, a Hall voltage V H proportional to the magnetic field strength will be generated across the element. The stronger the magnetic field, the larger the Hall voltage V H . And the magnetic field strength is proportional to the primary current I p , so the Hall voltage V H indirectly reflects the size of the primary current I p . The Hall voltage V H output by the Hall element is a weak signal, so it can be amplified and conditioned by an operational amplifier, Figure 1 In the operational amplifier, +U c and -U c of the operational amplifier are connected to the supply voltage, which is used to power the operational amplifier. The sampling output voltage V OUT after amplification by the operational amplifier, the sampling output voltage V OUT is linearly proportional to the primary current I p , that is, the larger the primary current I p , the larger the sampling output voltage V OUT .

[0054] The power supply of the small open loop current acquisition device is usually provided by an external power source, which can supply power to the small open loop current acquisition device through a connector. The sampling output voltage V OUT output by the small open loop current acquisition device also needs to be sent to the external device connected thereto through the connector.

[0055] Exemplarily, Figure 2 A schematic diagram of the application of a current acquisition device is provided, which can be a small open loop circuit acquisition device, as Figure 2 shown, the small open loop current acquisition device can be connected to the BMS through the wire harness connector, and then the sampling voltage output by the small open loop current acquisition device can be transmitted to the BMS through the wire harness connector.

[0056] However, the current acquisition device may be inaccurate due to the failure of the internal Hall element, or due to the impedance problem of the connector.

[0057] Since the connector and the shell of the current collection device are usually integrated, the fault position of the current collection device cannot be located under non-destructive conditions, that is, it cannot be determined whether the inaccuracy of the current sampling result is caused by the failure of the internal Hall element or the change of the impedance of the connector, which affects the reliability of the current collection device.

[0058] It should be noted that the current collection device involved in the present application can include but is not limited to the above-mentioned small open-loop current collection device, for example, it can be other open-loop current collection device, or it can be a closed-loop current collection device including a Hall element, etc.

[0059] Based on this, the embodiment of the present application provides a current collection device, by setting a signal back collection circuit for collecting internal power supply voltage and internal output voltage in the current collection device, and sending the back collection power supply voltage and the back collection output voltage collected by the signal back collection circuit to the external device through the communication module in communication connection with the external device, so that the comparison result of the actual provided power supply voltage and the back collection power supply voltage, the comparison result of the sampling voltage and the back collection output voltage can be output to determine the abnormal situation of the change of the impedance of the connector, and then the abnormal situation of the impedance of the connector can be accurately located under non-destructive condition, and the reliability of the current collection device is improved.

[0060] The current collection device provided by the embodiment of the present application is introduced below in combination with the drawings:

[0061] Please refer to Figure 3 , Figure 3 The architecture schematic diagram of the current collection device provided by the embodiment of the present application is shown, as Figure 3 shown, the current collection device 30 in the embodiment of the present application can be connected to the external device 20 through the connector 31, and the external device 20 can provide the power supply voltage V cc to the current collection device 30 through the connector 31, and the current collection device 30 feeds back the sampling output voltage V OUT through the connector 31.

[0062] In the embodiment of the present application, the above-mentioned current collection device 30 includes the connector 31, the Hall element 32, the signal back collection circuit 33 and the communication module 34, the above-mentioned signal back collection circuit 33 can be connected with the internal power supply circuit and the output end of the Hall element 32 of the current collection device 30 respectively, and is configured to collect the internal power supply voltage, and output the back collection power supply voltage and the internal output voltage, and output the back collection output voltage.

[0063] The signal input end of the communication module 34 can be connected with the signal output end of the signal back sampling circuit 33, and the communication module 34 can be configured to be in communication connection with the external device 20 and send the back sampling power supply voltage and the back sampling output voltage collected by the signal back sampling circuit 33 to the external device 20.

[0064] Here, the internal power supply circuit of the current collection device 30 can refer to a circuit for providing a power supply voltage for the power supply elements (such as Hall elements, operational amplifiers, filter circuits, etc.) in the current collection device 30 through the connector 31.

[0065] In the embodiments of the present application, the output end of the Hall element 32 can specifically refer to the position of the current collection device internal circuit output sampling output voltage, for example, but not limited to, the output end of the operational amplifier.

[0066] It can be understood that the external device 20 can be, but is not limited to, a battery management system (Battery Management System, BMS), a battery management unit (Battery Management Unit, BMU), and the like, which is a device for current sampling control of the battery.

[0067] Of course, the external device 20 can also be a device for current sampling of other application current collection devices, such as a motor controller and the like.

[0068] In specific applications, the signal back sampling circuit 33 can collect the internal power supply voltage and the internal output voltage of the current collection device 30, which can be implemented by a voltage sampling circuit, for example, but not limited to, voltage sampling by a voltage sampling sensor, voltage sampling by a resistance voltage sampling circuit, voltage sampling by a capacitance voltage sampling circuit, and voltage sampling by a special voltage sampling chip.

[0069] The communication module 34 can be a processing chip with the ability to convert the signals collected by the signal back sampling circuit 33 into signals required by the external device 20. Specifically, the internal power supply voltage and the internal output voltage collected by the signal back sampling circuit 33 can be analog signals, and the communication module 34 can receive the analog signals collected by the signal back sampling circuit and convert the received analog signals into corresponding digital signals, and then package the digital signals according to the communication protocol corresponding to the communication link of the external device 20, and then send the packaged signals to the external device 20.

[0070] In this way, the external device 20 can determine whether the impedance of the power supply circuit of the connector 31 is abnormal according to the comparison result of the actual power supply voltage V cc and the back sampling power supply voltage inside the current collection device 30, and can determine whether the impedance of the power supply circuit of the connector 31 is abnormal according to the sampling output voltage VOUT and the comparison result of the output sampling voltage and the output voltage determines whether the impedance of the signal transmission line of the connector is abnormal.

[0071] In a specific application, if the actually provided supply voltage V cc If the difference between the output sampling voltage and the output voltage is greater than a first preset difference threshold, it can be determined that the impedance of the supply line of the connector 31 is abnormal, otherwise it is considered that the impedance of the supply line of the connector 31 is not abnormal. If the difference between the output sampling voltage and the output voltage is greater than a second preset difference threshold, it can be determined that the impedance of the signal transmission line of the connector 31 is abnormal, otherwise it is considered that the impedance of the signal transmission line of the connector 31 is not abnormal.

[0072] It can be understood that the first preset difference threshold and the second preset difference threshold can be set according to actual application conditions.

[0073] In a specific application, the supply line of the connector can be a line that supplies power to the current collection device through the connector, and the signal transmission line of the connector can be a transmission line that transmits the sampling output voltage output by the Hall element or the sampling output voltage output after being amplified and processed by the operational amplifier to the external device 20.

[0074] As can be seen from the above, the current collection device provided by the embodiments of the present application sets a signal collection circuit for collecting internal supply voltage and internal output voltage in the current collection device, and sends the collected output voltage and the collected output voltage to the external device through the communication module in communication with the external device. Thus, according to the comparison result of the actually provided supply voltage and the collected supply voltage, the comparison result of the output sampling voltage and the collected output voltage, the abnormality of the impedance change of the connector can be determined, and the inaccuracy of the current sampling of the current collection device caused by the abnormal impedance of the connector can be accurately located without damage, thereby improving the reliability of the current collection device.

[0075] In an embodiment of the present application, please refer to Figure 4 , Figure 4 shows a schematic diagram of the architecture of a current collection device provided by another embodiment of the present application. As Figure 4 shown, the signal collection circuit 33 can include a first sampling unit 331 and a second sampling unit 332. The signal collection end of the first sampling unit 331 is connected to the supply input end of the Hall element 32, the signal output end of the first sampling unit 331 is connected to the first signal input end 1 of the communication module 34, and the signal collection end of the second sampling unit 332 is connected to the signal output end of the Hall element. The signal output end of the second sampling unit 332 is connected to the second signal input end 2 of the communication module 34.

[0076] In a specific application, the first sampling unit 331 is configured to collect the internal power supply voltage of the current collection device 30, and the second sampling unit 332 is configured to collect the internal output voltage of the current collection device 30.

[0077] In a specific application, the first sampling unit 331 can use a voltage sampling circuit to sample the internal power supply voltage, for example, but not limited to, sampling the internal power supply voltage through a voltage sampling sensor, sampling the internal power supply voltage using a resistor voltage division sampling circuit, sampling the internal power supply voltage using a capacitor voltage division sampling circuit, sampling the internal power supply voltage through a dedicated voltage sampling chip, etc.

[0078] The second sampling unit 332 can also use a voltage sampling circuit to sample the internal output voltage, for example, but not limited to, sampling the internal output voltage through a voltage sampling sensor, sampling the internal output voltage using a resistor voltage division sampling circuit, sampling the internal output voltage using a capacitor voltage division sampling circuit, sampling the internal output voltage through a dedicated voltage sampling chip, etc.

[0079] In the embodiment of the present application, the first sampling unit 331 and the second sampling unit 332 can respectively sample the internal power supply voltage and the internal output voltage of the current collection device, which can reduce the interference between the two collection signals.

[0080] Please refer to Figure 5 , Figure 5 A circuit implementation schematic diagram of the current collection device provided by the embodiment of the present application is shown. As Figure 5 shown, in an embodiment of the present application, the first sampling unit 331 can include a first voltage dividing resistor R1, a second voltage dividing resistor R2, and a first current limiting resistor R3.

[0081] The first end of the first voltage dividing resistor R1 is the signal collection end of the first sampling unit 331, the second end of the first voltage dividing resistor R1 is connected to the first end of the second voltage dividing resistor R2 and the first end of the first current limiting resistor R3, respectively, the second end of the second voltage dividing resistor R2 is grounded, and the second end of the first current limiting resistor R3 is the signal output end of the first sampling unit 331 (i.e., connected to the communication module 34).

[0082] In a specific application, the first voltage dividing resistor R1 and the second voltage dividing resistor R2 constitute a resistor voltage division sampling circuit, and through the resistor voltage division sampling circuit, the internal power supply voltage of the current collection device 30 can be voltage division sampled. The first current limiting resistor R3 plays a role of current limiting protection.

[0083] In the embodiment of the present application, the internal power supply voltage can be collected by using simple resistor elements, which is simple and low in implementation cost.

[0084] Please refer to Figure 5 , the second sampling unit 332 can include a third voltage dividing resistor R4, a fourth voltage dividing resistor R5, and a second current limiting resistor R6.

[0085] The first end of the third voltage dividing resistor R4 is the signal collection end of the second sampling unit 332, the second end of the third voltage dividing resistor R4 is connected to the first end of the fourth voltage dividing resistor R5 and the first end of the second current limiting resistor R6 respectively, the second end of the fourth voltage dividing resistor R5 is grounded, and the second end of the second current limiting resistor R6 is the signal output end of the second sampling unit 332 (i.e., connected to the communication module 34).

[0086] In a specific application, the third voltage dividing resistor R4 and the fourth voltage dividing resistor R5 constitute a resistance voltage dividing sampling circuit, and through the resistance voltage dividing sampling circuit, the internal output voltage of the current collection device 30 can be sampled. The second current limiting resistor R6 plays a role of current limiting protection.

[0087] In the embodiments of the present application, the collection of the internal output voltage can be realized by using simple resistance elements, which is simple and low in implementation cost.

[0088] In some embodiments of the present application, the communication module 34 can be a wired communication module, and the communication module 34 can be connected to an external device through a signal line, and the back sampling supply voltage and the back sampling output voltage collected by the signal back sampling circuit 33 can be transmitted to the external device through the signal line.

[0089] Please refer to Figure 6 , Figure 6 Another circuit implementation schematic diagram of a current collection device is shown. As Figure 6 shown, in an embodiment of the present application, the signal line can be a CAN bus.

[0090] The controller area network bus is a physical transmission bus based on the controller area network (CAN) communication protocol. The CAN bus is used to realize the back transmission of the back sampling signal of the current collection device, which is easy to implement and can provide a reliable data transmission path.

[0091] In Figure 6 the example shown, the current collection device 30 is connected to an external BMS, and the BMS provides a supply voltage V cc to power the Hall element 32 inside the current collection device 30, and the Hall element 32 senses the current to generate a corresponding output sampling voltage V OUTThe current is transmitted back to the BMS for current recording. The internal power supply voltage is sampled by using a first voltage dividing resistor R1 and a second voltage dividing resistor R2, the internal output voltage is sampled by using a third voltage dividing resistor R4 and a fourth voltage dividing resistor R5, the communication module 34 includes a processing chip MCU, the sampled signals are transmitted to the MCU for processing, and the processed digital signals are transmitted to the BMS through a CAN signal. The BMS compares the sampled power supply voltage and the actually provided power supply voltage, the sampled output signal and the sampled output voltage V OUT The current is transmitted back to the BMS for current recording. The internal power supply voltage is sampled by using a first voltage dividing resistor R1 and a second voltage dividing resistor R2, the internal output voltage is sampled by using a third voltage dividing resistor R4 and a fourth voltage dividing resistor R5, the communication module 34 includes a processing chip MCU, the sampled signals are transmitted to the MCU for processing, and the processed digital signals are transmitted to the BMS through a CAN signal. The BMS compares the sampled power supply voltage and the actually provided power supply voltage, the sampled output signal and the sampled output voltage V

[0092] Please refer to Figure 7 , Figure 7 Another circuit implementation schematic diagram of the current collection device provided by the embodiment of the application is shown. As shown in Figure 7 In the embodiment of the application, the signal line can be an RS485 bus.

[0093] The industrial serial bus (RS485 bus) is a physical transmission bus provided based on the RS485 standard, the RS485 protocol is a differential signal transmission serial communication standard, mainly used for long-distance and multi-point communication between devices in an industrial control and automation system, and is one of the most widely used bus standards in the industrial field. The RS485 bus has strong anti-common-mode interference ability, and can improve the reliability of the communication module 34.

[0094] In Figure 7 the example shown, the current collection device 30 is connected to an external BMS, and the BMS provides a power supply voltage V cc to the Hall element 32 inside the current collection device 30 for power supply. The Hall element 32 senses the current and generates a corresponding output sampling voltage V OUT transmitted back to the BMS for current recording. The internal power supply voltage is sampled by using a first voltage dividing resistor R1 and a second voltage dividing resistor R2, the internal output voltage is sampled by using a third voltage dividing resistor R4 and a fourth voltage dividing resistor R5, the communication module 34 includes a processing chip MCU, the sampled signals are transmitted to the MCU for processing, and the processed digital signals are transmitted to the BMS through a CAN signal. The BMS compares the sampled power supply voltage and the actually provided power supply voltage, the sampled output signal and the sampled output voltage V OUT The current is transmitted back to the BMS for current recording. The internal power supply voltage is sampled by using a first voltage dividing resistor R1 and a second voltage dividing resistor R2, the internal output voltage is sampled by using a third voltage dividing resistor R4 and a fourth voltage dividing resistor R5, the communication module 34 includes a processing chip MCU, the sampled signals are transmitted to the MCU for processing, and the processed digital signals are transmitted to the BMS through a CAN signal. The BMS compares the sampled power supply voltage and the actually provided power supply voltage, the sampled output signal and the sampled output voltage V

[0095] Please refer to Figure 8 , Figure 8 Another circuit implementation schematic diagram of the current collection device provided by the embodiment of the application is shown. As shown in Figure 8As shown, in an embodiment of the present application, the signal line can be an I2C bus.

[0096] The Inter-Integrated Circuit (I2C) bus is a simple, bidirectional two-wire synchronous serial bus, which can realize signal transmission only by a serial data line (SDA) and a serial clock line (SCL), and has the characteristics of simple hardware implementation, strong reliability and low power consumption.

[0097] In Figure 8 In the example shown, the current acquisition device 30 is connected to an external BMS, and the BMS provides a power supply voltage V cc to power the Hall element 32 inside the current acquisition device 30, and the Hall element 32 senses the current to generate a corresponding output sampling voltage V OUT which is transmitted back to the BMS for current recording. The first voltage dividing resistor R1 and the second voltage dividing resistor R2 are used to sample the internal power supply voltage, the third voltage dividing resistor R4 and the fourth voltage dividing resistor R5 are used to sample the internal output voltage, and the communication module 34 includes a processing chip MCU. The sampled signals are transmitted to the MCU for processing, and the processed digital signals are transmitted to the BMS through the I2C bus signal. The BMS compares the sampled power supply voltage and the actual power supply voltage, the sampled output signal and the sampled output voltage V OUT , so as to determine the specific fault cause when the current sampling is abnormal according to the judgment result.

[0098] Please refer to Figure 9 , Figure 9 Another circuit implementation schematic diagram of a current acquisition device provided by an embodiment of the present application is shown. As Figure 9 shown, in some embodiments of the present application, the communication module 34 can be a wireless communication module, that is, it communicates with external devices through wireless communication.

[0099] The wireless communication manner includes, but is not limited to, global system for mobile communications (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (LTE), Bluetooth (BT), global navigation satellite system (GNSS), wireless local area network (WLAN), near field communication (NFC), infrared (IR) technology, and the like. The GNSS can include global positioning system (GPS), global navigation satellite system (GLONASS), Beidou satellite navigation system (BDS), quasi-zenith satellite system (QZSS), satellite based augmentation systems (SBAS), and the like.

[0100] In some embodiments of the present application, the signal recovery circuit 33 and the communication module 34 can be integrated on the PCBA assembly of the current collection device.

[0101] In this way, the integration of the current collection device can be realized, the volume can be reduced, and the implementation cost can be reduced.

[0102] In some embodiments of the present application, in order to improve the anti-interference ability of the current collection device to the impedance change of the connector, the connector can output a power supply signal V cc or receive a sampling output voltage V OUT The port can be designed in a double-line parallel manner.

[0103] In practical applications, the two-wire parallel connection method refers to a single signal port (which can be the output power supply signal V) cc The port can also be used to receive the sampled output voltage V. OUT The port is implemented using two pins connected in parallel.

[0104] For example, such as Figure 10 As shown, the connector outputs a power supply signal V. cc The port or the receiving sampling output voltage V OUT The port uses a two-wire parallel connection for transmission. The impedance corresponding to the first pin of the connector is defined as HR1, and the impedance corresponding to the second pin of the connector is defined as HR2. Assuming that the impedance of the first pin is abnormal (increased), the impedance of the entire transmission signal port can be reduced by connecting it in parallel with the second pin, thereby reducing the impact of abnormal impedance. This can effectively reduce and improve the anti-interference ability of the current acquisition device to the connector impedance change, and improve the reliability of the current acquisition device.

[0105] This application embodiment can also provide a battery management system, which may include the current acquisition device as described in the above embodiments, and use the current acquisition device described in the above embodiments to acquire the battery current.

[0106] This application embodiment may also provide a battery, which may include a battery module and a battery management system as described above connected to the battery.

[0107] In this embodiment of the application, the battery provided may include a housing, a battery module housed inside the housing, a battery management system module, electrical components that realize the electrical connection of the battery, and an interface for connection with the outside.

[0108] The aforementioned battery module can be a device composed of one or more battery cells connected in series, parallel, or series-parallel configurations, and has only one pair of positive and negative output terminals. A battery cell can be a basic unit that directly converts chemical energy into electrical energy, typically including: electrodes, a separator, an electrolyte, a casing, and terminals.

[0109] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules / units is taken as an example, and in actual application, the above functions can be completed by different functional modules / units according to needs, that is, the internal structure of the control device is divided into different functional modules / units to complete all or part of the functions described above. Each functional module / unit in the embodiment can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of software functional module / unit. In addition, the specific names of each functional module / unit are only for easy distinction, and do not limit the protection scope of the application. The specific working process of each unit in the control device can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

[0110] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can refer to the related description of other embodiments.

[0111] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or in combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0112] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A current acquisition device, characterized in that, include: The Hall element is configured to output a sampled output voltage corresponding to the sampled current; A connector configured to connect to an external device to feed back the sampled output voltage to the external device and to transmit an external power supply voltage to the current acquisition device; The signal acquisition circuit is connected to the internal power supply line of the current acquisition device and the output terminal of the Hall element, respectively, and is configured to acquire the internal power supply voltage and output the acquired power supply voltage; and acquire the internal output voltage and output the acquired output voltage. The communication module is connected to the signal acquisition circuit and communicates with the external device, and is configured to send the acquisition power supply voltage and acquisition output voltage to the external device.

2. The current acquisition device according to claim 1, characterized in that, The signal acquisition circuit includes: The first sampling unit has its signal acquisition terminal connected to the power supply input terminal of the Hall element and its signal output terminal connected to the first signal input terminal of the communication module, and is configured to acquire the internal power supply voltage of the current acquisition device. The second sampling unit has its signal acquisition terminal connected to the signal output terminal of the Hall element and its signal output terminal connected to the second signal input terminal of the communication module, and is configured to acquire the internal output voltage of the current acquisition device.

3. The current acquisition device according to claim 2, characterized in that, The first sampling unit includes a first voltage divider resistor, a second voltage divider resistor, and a first current limiting resistor; The first end of the first voltage divider resistor is the signal acquisition end of the first sampling unit. The second end of the first voltage divider resistor is connected to the first end of the second voltage divider resistor and the first end of the first current limiting resistor. The second end of the second voltage divider resistor is grounded. The second end of the first current limiting resistor is the signal output end of the first sampling unit.

4. The current acquisition device according to claim 2, characterized in that, The second sampling unit includes a third voltage divider resistor, a fourth voltage divider resistor, and a second current limiting resistor; The first end of the third voltage divider resistor is the signal acquisition end of the second sampling unit. The second end of the third voltage divider resistor is connected to the first end of the fourth voltage divider resistor and the first end of the second current limiting resistor, respectively. The second end of the fourth voltage divider resistor is grounded. The second end of the second current limiting resistor is the signal output end of the second sampling unit.

5. The current acquisition device according to any one of claims 1 to 4, characterized in that, The communication module is a wired communication module.

6. The current acquisition device according to claim 5, characterized in that, The communication module is connected to the external device via a controller area network bus. Alternatively, the communication module can be connected to the external device via an industrial serial bus. Alternatively, the communication module can be connected to the external device via an integrated circuit bus.

7. The current acquisition device according to any one of claims 1 to 4, characterized in that, The communication module is a wireless communication module.

8. The current acquisition device according to claim 1, characterized in that, The current acquisition device includes a printed circuit board assembly; The signal acquisition circuit and the communication module are integrated into the printed circuit board assembly.

9. A battery management system, characterized in that, The battery management system includes the current acquisition device as described in any one of claims 1 to 8.

10. A battery, characterized in that, include: Box; A battery module housed inside the housing and a battery management system as described in claim 9.

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